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DESCRIPTION: Twins are Male female twins sexuality offspring produced by the same pregnancy. In contrast, a fetus that develops alone in the womb is called a singletonand the general term for one offspring of a multiple birth is multiple.

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An page questionnaire on the "sexuality of twins" was filled out by one or both twins. Thirty-eight pairs of monozygotic twins (34 male pairs and 4 female. If sexuality is not a choice, why do some identical twins have different sexual .. “ Thirty-eight pairs of monozygotic twins (34 male pairs and 4 female pairs) were. Boy/girl twins are always fraternal or (dizygotic); they can only form from two that contains either male (XY) or female (XX) sex chromosomes.

Twins are two offspring produced by the same pregnancy. In contrast, a Male female twins sexuality that develops alone in the womb is called a singletonand the general term for one offspring of a multiple birth is multiple. The Yoruba peoples Male female twins sexuality the highest rate of twinning in the world, at 45—50 twin sets or 90— twins per 1, live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may stimulate the ovaries to release an egg from each side.

In Central Africathere are 18—30 twin sets or 36—60 twins per 1, live births. North America and Europe have intermediate rates of 9 to 16 twin sets per 1, live births. Multiple pregnancies are much less likely to carry to full term than single births, with twin pregnancies lasting on average 37 weeks, three weeks less than full term. Women who have a family history of fraternal twins have a higher chance of producing fraternal twins themselves, as there is a genetically linked tendency to hyper- ovulate.

There is no known genetic link for identical twinning. The vast majority of twins are either dizygotic fraternal or monozygotic identical. Less common variants are discussed further down the article. Among non-twin births, male singletons are slightly about Male female twins sexuality percent more common than female singletons. The rates for singletons vary slightly by country.

For example, the sex ratio of birth in the US is 1. Zygosity is the degree of identity in the genome of twins. Dizygotic DZ or fraternal twins also referred to as "non-identical twins", "dissimilar twins", "biovular twins", and, informally in the case of females, "sororal twins" usually occur when two fertilized eggs are implanted in the uterus wall at the same time. When two eggs are independently fertilized by two different sperm cells, fraternal twins result.

The two eggs, or ovaform two zygoteshence the terms dizygotic and biovular. Fraternal twins are, essentially, two ordinary siblings who happen to be born at the same time, since they arise from two separate eggs fertilized by two separate sperm, just like ordinary siblings.

This is the most common type of twin. Dizygotic twins, like any other siblings, have an extremely small chance of having the same chromosome profile. Even if they happen to have the same chromosome profile, they will always have different genetic material on each chromosome, due to chromosomal crossover during meiosis. Like any other siblingsdizygotic twins may look similar, particularly given that they are the same age.

However, dizygotic twins may also look very different from each other. Studies show that there is a genetic proclivity for dizygotic twinning. However, it is only the mother who has any effect on Male female twins sexuality chances of having such twins; there is no known mechanism for a father to cause the release of more than one ovum. Dizygotic twinning ranges from six per thousand births in Japan similar to the rate of monozygotic twins to 14 and more per thousand in some African countries.

Dizygotic twins are also more common for older mothers, with twinning rates doubling in mothers over the age of Monozygotic MZ Male female twins sexuality identical twins occur when a single egg is fertilized to form one zygote hence, "monozygotic" Male female twins sexuality then divides into two separate embryos.

Regarding spontaneous or natural monozygotic twinning, a recent theory proposes that monozygotic twins are formed after a blastocyst essentially collapses, splitting the progenitor cells those that contain the body's fundamental genetic material in Male female twins sexuality, leaving the same genetic material Male female twins sexuality in two on opposite sides of Male female twins sexuality embryo.

Eventually, two separate fetuses develop. Monozygotic twins may also be created artificially by embryo splitting. It can be used as an expansion of in vitro fertilization IVF to increase the number of available embryos for embryo transfer. Monozygotic twinning occurs in birthing at a rate of about 3 in every deliveries worldwide.

The likelihood of a single fertilization resulting in monozygotic twins is uniformly distributed in all populations around the world. IVF techniques are more likely to create dizygotic twins. For IVF deliveries, there are nearly 21 pairs of twins for every 1, Monozygotic twins are genetically nearly identical and they are always the same sex unless there has been a mutation during development.

The children of monozygotic twins test genetically as half-siblings or full siblings, if a pair Male female twins sexuality monozygotic twins reproduces with another pair or with the same personrather than first cousins. Identical twins do not have the same fingerprints however, because even within the confines of the womb, the fetuses touch different parts of their environment, giving rise to small variations in their corresponding prints and thus making them unique.

Monozygotic twins always have different phenotypes. Normally due to an environmental factor or the deactivation of different X chromosomes in female monozygotic twins, and in some extremely rare cases, due to aneuploidytwins may express different sexual phenotypesnormally from an Male female twins sexuality Klinefelter syndrome zygote splitting unevenly.

Monozygotic twins, although genetically very similar, are not genetically exactly the same. The DNA in white blood Male female twins sexuality of 66 pairs of monozygotic twins was analyzed forsingle-nucleotide polymorphisms known to occur in human Male female twins sexuality. Polymorphisms appeared in 2 of the 33 million comparisons, leading the researchers to extrapolate that the blood cells of monozygotic twins may have on the order of one DNA-sequence difference for every 1.

If Male female twins sexuality occur early in fetal development, they will be present in a very large proportion of body cells. Another cause of difference between monozygotic twins is epigenetic modificationcaused by differing environmental influences throughout their lives. Epigenetics refers to the level of activity of any particular gene. A gene may become switched Male female twins sexuality, switched off, or could become partially switched on or off in an individual.

This epigenetic modification is triggered by environmental events. Monozygotic twins can have markedly different epigenetic profiles. A study of 80 pairs of monozygotic twins ranging in age from three to 74 showed that the youngest twins have relatively few epigenetic differences. The number of epigenetic differences increases with age. Fifty-year-old twins Male female twins sexuality over three times the epigenetic difference of three-year-old twins.

Twins who had spent their lives apart such as those adopted by two different sets of parents at birth had Male female twins sexuality greatest difference. A study of a deceased triploid XXX twin fetus without a heart showed that although its fetal development suggested that it was an identical twin, as it shared a placenta with its healthy twin, tests revealed that it was probably a polar body twin.

The Male female twins sexuality were unable to predict whether a healthy fetus could result from a polar body twinning. Ina study argued that many cases of triploidity arise from semi-identical twinning. Ina study reported a case of a pair of living twins, Male female twins sexuality intersex and one a phenotypical male.

The exact mechanism of fertilization could not be determined but the study stated that it was unlikely to be a case of polar body twinning. The degree of separation of the twins in utero depends on if and when they split into two zygotes. Dizygotic twins were always two zygotes. Monozygotic twins split into two zygotes at some time very early in the pregnancy. The timing of this separation determines the chorionicity the number of placentae and amniocity the number of sacs of the pregnancy. Dichorionic twins either never divided i.

Monoamnionic twins divide after the first week. In very rare cases, twins become conjoined twins. Non-conjoined monozygotic twins form up to day 14 of embryonic development, but when twinning occurs after 14 days, the twins will likely be conjoined. It is a common misconception that two placentas means twins are dizygotic.

But if monozygotic twins separate early enough, the arrangement of sacs and placentas in utero is indistinguishable from dizygotic twins. DiDi twins have the lowest mortality risk at about 9 percent, although that is still significantly higher than that of singletons.

Monochorionic twins share the same placentaand thus have a risk of twin-to-twin transfusion syndrome. Monoamniotic twins are always monozygotic. Monoamniotic twins, as with diamniotic monochorionic twins, have a risk of twin-to-twin transfusion syndrome. Also, the two umbilical cords have an increased chance of being tangled around the babies. Because of this, there is an increased chance that the newborns may be miscarried or suffer from cerebral palsy due to lack of oxygen. Mortality is highest for conjoined twins due to the many complications resulting from shared organs.

Dichorionic-diamniotic twins at 8 weeks and 5 days since co-incubation as part of IVF. The twin at left in the image is shown in the sagittal plane with the head pointing towards upper left. The twin at right in the image is shown in the coronal plane with the head pointing rightwards. Abdominal ultrasonography of monoamniotic twins at a gestational age of 15 weeks. There is no sign of any membrane between Male female twins sexuality fetuses.

A coronal plane is shown of the twin at left, and a sagittal plane of parts of the upper thorax and head is Male female twins sexuality of the twin at right. A study has found Male female twins sexuality insulin-like growth factor present in dairy products may increase the chance of dizygotic twinning.

Specifically, the study found that vegan mothers who exclude dairy from their diets are one-fifth as likely to have twins as vegetarian or omnivore mothers, and concluded that "Genotypes favoring elevated IGF and diets including dairy products, especially in areas where growth hormone is given to cattle, appear to enhance the chances of multiple pregnancies due to ovarian stimulation.

It may also be linked to the increase of growth hormones in food. About 1 in 90 human births 1. The widespread use of fertility drugs causing hyperovulation stimulated release of multiple eggs by the mother has caused what some call an "epidemic of multiple births ". Nevertheless, the rate of monozygotic twins remains at about 1 in across the globe. In a study on the maternity records of Hausa women living in the Savannah zone of Nigeriathere were 40 twins Male female twins sexuality 2 triplets per births.

Twenty-six percent of twins were monozygotic. The incidence of multiple births, which was about five times higher than that observed in any western population, was significantly lower than that of other ethnic groups, who live in the hot and humid climate of the southern part of the country. The incidence of multiple births was related to maternal age but did not bear any association to the climate or prevalence of malaria.

Dizygotic twin pregnancies are slightly more likely when the following factors are present in the woman:. Women undergoing certain fertility treatments may have a greater chance of dizygotic multiple births.

The risk of twin birth can vary depending on what types of fertility treatments are used. With in vitro fertilisation IVFthis is primarily due to the insertion of multiple embryos into the uterus. Ovarian hyperstimulation without IVF has a very high risk of multiple birth. Reversal of anovulation with clomifene trade names including Clomid has a relatively less but yet significant risk of multiple pregnancy.

A year German study [60] of 8, vaginally delivered twins that is, 4, pregnancies in Hesse yielded a mean delivery time interval of

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  • Boy/girl twins are always fraternal or (dizygotic); they can only form from two that contains either male (XY) or female (XX) sex chromosomes.
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  • The Journal of Sex Research Vol. 34, No. 2, pp. A Twin Registry Study of Male and Female. Sexual Orientation. Scott L. Hershberger. University.

Size Zero - Yay or nay? Effect of having a same-sex versus opposite-sex co-twin for female (white bars) and male (gray bars) fitness in premodern Finland. Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic Female–female: Sometimes called sororal twins; Male–male twins: No special name .. Another abnormality that can result in monozygotic twins of different sexes is if the egg is fertilized by a male sperm but during cell division..

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who are opposite-sex twins are twice as likely as expected to report same-sex attraction male and female sexual orientation” (Hershberger , p. 43). Oddly. If sexuality is not a choice, why do some identical twins have different sexual .. “ Thirty-eight pairs of monozygotic twins (34 male pairs and 4 female pairs) were. Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic Female–female: Sometimes called sororal twins; Male–male twins: No special name .. Another abnormality that can result in monozygotic twins of different sexes is if the egg is fertilized by a male sperm but during cell division.

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